print-ether.c revision 172686 
1/*
2 * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 2000
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that: (1) source code distributions
7 * retain the above copyright notice and this paragraph in its entirety, (2)
8 * distributions including binary code include the above copyright notice and
9 * this paragraph in its entirety in the documentation or other materials
10 * provided with the distribution, and (3) all advertising materials mentioning
11 * features or use of this software display the following acknowledgement:
12 * ``This product includes software developed by the University of California,
13 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
14 * the University nor the names of its contributors may be used to endorse
15 * or promote products derived from this software without specific prior
16 * written permission.
17 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
18 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
20 *
21 * $FreeBSD: head/contrib/tcpdump/print-ether.c 172686 2007-10-16 02:31:48Z mlaier $
22 */
23#ifndef lint
24static const char rcsid[] _U_ =
25    "@(#) $Header: /tcpdump/master/tcpdump/print-ether.c,v 1.95.2.6 2006/02/20 18:15:03 hannes Exp $ (LBL)";
26#endif
27
28#ifdef HAVE_CONFIG_H
29#include "config.h"
30#endif
31
32#include <tcpdump-stdinc.h>
33
34#include <stdio.h>
35#include <pcap.h>
36
37#include "interface.h"
38#include "addrtoname.h"
39#include "ethertype.h"
40
41#include "ether.h"
42
43const struct tok ethertype_values[] = {
44    { ETHERTYPE_IP,		"IPv4" },
45    { ETHERTYPE_MPLS,		"MPLS unicast" },
46    { ETHERTYPE_MPLS_MULTI,	"MPLS multicast" },
47    { ETHERTYPE_IPV6,		"IPv6" },
48    { ETHERTYPE_8021Q,		"802.1Q" },
49    { ETHERTYPE_VMAN,		"VMAN" },
50    { ETHERTYPE_PUP,            "PUP" },
51    { ETHERTYPE_ARP,            "ARP"},
52    { ETHERTYPE_REVARP,         "Reverse ARP"},
53    { ETHERTYPE_NS,             "NS" },
54    { ETHERTYPE_SPRITE,         "Sprite" },
55    { ETHERTYPE_TRAIL,          "Trail" },
56    { ETHERTYPE_MOPDL,          "MOP DL" },
57    { ETHERTYPE_MOPRC,          "MOP RC" },
58    { ETHERTYPE_DN,             "DN" },
59    { ETHERTYPE_LAT,            "LAT" },
60    { ETHERTYPE_SCA,            "SCA" },
61    { ETHERTYPE_LANBRIDGE,      "Lanbridge" },
62    { ETHERTYPE_DECDNS,         "DEC DNS" },
63    { ETHERTYPE_DECDTS,         "DEC DTS" },
64    { ETHERTYPE_VEXP,           "VEXP" },
65    { ETHERTYPE_VPROD,          "VPROD" },
66    { ETHERTYPE_ATALK,          "Appletalk" },
67    { ETHERTYPE_AARP,           "Appletalk ARP" },
68    { ETHERTYPE_IPX,            "IPX" },
69    { ETHERTYPE_PPP,            "PPP" },
70    { ETHERTYPE_SLOW,           "Slow Protocols" },
71    { ETHERTYPE_PPPOED,         "PPPoE D" },
72    { ETHERTYPE_PPPOES,         "PPPoE S" },
73    { ETHERTYPE_EAPOL,          "EAPOL" },
74    { ETHERTYPE_JUMBO,          "Jumbo" },
75    { ETHERTYPE_LOOPBACK,       "Loopback" },
76    { ETHERTYPE_ISO,            "OSI" },
77    { ETHERTYPE_GRE_ISO,        "GRE-OSI" },
78    { 0, NULL}
79};
80
81static inline void
82ether_hdr_print(register const u_char *bp, u_int length)
83{
84	register const struct ether_header *ep;
85	ep = (const struct ether_header *)bp;
86
87	(void)printf("%s > %s",
88		     etheraddr_string(ESRC(ep)),
89		     etheraddr_string(EDST(ep)));
90
91	if (!qflag) {
92	        if (ntohs(ep->ether_type) <= ETHERMTU)
93		          (void)printf(", 802.3");
94                else
95		          (void)printf(", ethertype %s (0x%04x)",
96				       tok2str(ethertype_values,"Unknown", ntohs(ep->ether_type)),
97                                       ntohs(ep->ether_type));
98        } else {
99                if (ntohs(ep->ether_type) <= ETHERMTU)
100                          (void)printf(", 802.3");
101                else
102                          (void)printf(", %s", tok2str(ethertype_values,"Unknown Ethertype (0x%04x)", ntohs(ep->ether_type)));
103        }
104
105	(void)printf(", length %u: ", length);
106}
107
108void
109ether_print(const u_char *p, u_int length, u_int caplen)
110{
111	struct ether_header *ep;
112	u_short ether_type;
113	u_short extracted_ether_type;
114
115	if (caplen < ETHER_HDRLEN) {
116		printf("[|ether]");
117		return;
118	}
119
120	if (eflag)
121		ether_hdr_print(p, length);
122
123	length -= ETHER_HDRLEN;
124	caplen -= ETHER_HDRLEN;
125	ep = (struct ether_header *)p;
126	p += ETHER_HDRLEN;
127
128	ether_type = ntohs(ep->ether_type);
129
130	/*
131	 * Is it (gag) an 802.3 encapsulation?
132	 */
133	if (ether_type <= ETHERMTU) {
134		/* Try to print the LLC-layer header & higher layers */
135		if (llc_print(p, length, caplen, ESRC(ep), EDST(ep),
136		    &extracted_ether_type) == 0) {
137			/* ether_type not known, print raw packet */
138			if (!eflag)
139				ether_hdr_print((u_char *)ep, length + ETHER_HDRLEN);
140
141			if (!suppress_default_print)
142				default_print(p, caplen);
143		}
144	} else if (ether_encap_print(ether_type, p, length, caplen,
145	    &extracted_ether_type) == 0) {
146		/* ether_type not known, print raw packet */
147		if (!eflag)
148			ether_hdr_print((u_char *)ep, length + ETHER_HDRLEN);
149
150		if (!suppress_default_print)
151			default_print(p, caplen);
152	}
153}
154
155/*
156 * This is the top level routine of the printer.  'p' points
157 * to the ether header of the packet, 'h->ts' is the timestamp,
158 * 'h->len' is the length of the packet off the wire, and 'h->caplen'
159 * is the number of bytes actually captured.
160 */
161u_int
162ether_if_print(const struct pcap_pkthdr *h, const u_char *p)
163{
164	ether_print(p, h->len, h->caplen);
165
166	return (ETHER_HDRLEN);
167}
168
169/*
170 * Prints the packet encapsulated in an Ethernet data segment
171 * (or an equivalent encapsulation), given the Ethernet type code.
172 *
173 * Returns non-zero if it can do so, zero if the ethertype is unknown.
174 *
175 * The Ethernet type code is passed through a pointer; if it was
176 * ETHERTYPE_8021Q, it gets updated to be the Ethernet type of
177 * the 802.1Q payload, for the benefit of lower layers that might
178 * want to know what it is.
179 */
180
181int
182ether_encap_print(u_short ether_type, const u_char *p,
183    u_int length, u_int caplen, u_short *extracted_ether_type)
184{
185 recurse:
186	*extracted_ether_type = ether_type;
187
188	switch (ether_type) {
189
190	case ETHERTYPE_IP:
191	        ip_print(gndo, p, length);
192		return (1);
193
194#ifdef INET6
195	case ETHERTYPE_IPV6:
196		ip6_print(p, length);
197		return (1);
198#endif /*INET6*/
199
200	case ETHERTYPE_ARP:
201	case ETHERTYPE_REVARP:
202  	        arp_print(gndo, p, length, caplen);
203		return (1);
204
205	case ETHERTYPE_DN:
206		decnet_print(p, length, caplen);
207		return (1);
208
209	case ETHERTYPE_ATALK:
210		if (vflag)
211			fputs("et1 ", stdout);
212		atalk_print(p, length);
213		return (1);
214
215	case ETHERTYPE_AARP:
216		aarp_print(p, length);
217		return (1);
218
219	case ETHERTYPE_IPX:
220		printf("(NOV-ETHII) ");
221		ipx_print(p, length);
222		return (1);
223
224	case ETHERTYPE_8021Q:
225	        if (eflag)
226		    printf("vlan %u, p %u%s, ",
227			   ntohs(*(u_int16_t *)p) & 0xfff,
228			   ntohs(*(u_int16_t *)p) >> 13,
229			   (ntohs(*(u_int16_t *)p) & 0x1000) ? ", CFI" : "");
230
231		ether_type = ntohs(*(u_int16_t *)(p + 2));
232		p += 4;
233		length -= 4;
234		caplen -= 4;
235
236		if (ether_type > ETHERMTU) {
237		        if (eflag)
238			        printf("ethertype %s, ",
239				       tok2str(ethertype_values,"0x%04x", ether_type));
240			goto recurse;
241		}
242
243		*extracted_ether_type = 0;
244
245		if (llc_print(p, length, caplen, p - 18, p - 12,
246		    extracted_ether_type) == 0) {
247                        ether_hdr_print(p - 18, length + 4);
248
249                        if (!suppress_default_print) {
250                                default_print(p - 18, caplen + 4);
251                        }
252		}
253
254
255		return (1);
256
257        case ETHERTYPE_JUMBO:
258                ether_type = ntohs(*(u_int16_t *)(p));
259                p += 2;
260                length -= 2;
261                caplen -= 2;
262
263                if (ether_type > ETHERMTU) {
264                    if (eflag)
265                        printf("ethertype %s, ",
266                               tok2str(ethertype_values,"0x%04x", ether_type));
267                    goto recurse;
268                }
269
270                *extracted_ether_type = 0;
271
272                if (llc_print(p, length, caplen, p - 16, p - 10,
273                              extracted_ether_type) == 0) {
274                    ether_hdr_print(p - 16, length + 2);
275
276                    if (!suppress_default_print) {
277                            default_print(p - 16, caplen + 2);
278                    }
279                }
280
281                return (1);
282
283        case ETHERTYPE_ISO:
284                isoclns_print(p+1, length-1, length-1);
285                return(1);
286
287	case ETHERTYPE_PPPOED:
288	case ETHERTYPE_PPPOES:
289	case ETHERTYPE_PPPOED2:
290	case ETHERTYPE_PPPOES2:
291		pppoe_print(p, length);
292		return (1);
293
294	case ETHERTYPE_EAPOL:
295	        eap_print(gndo, p, length);
296		return (1);
297
298	case ETHERTYPE_PPP:
299		if (length) {
300			printf(": ");
301			ppp_print(p, length);
302		}
303		return (1);
304
305	case ETHERTYPE_SLOW:
306	        slow_print(p, length);
307		return (1);
308
309        case ETHERTYPE_LOOPBACK:
310                return (1);
311
312	case ETHERTYPE_MPLS:
313	case ETHERTYPE_MPLS_MULTI:
314		mpls_print(p, length);
315		return (1);
316
317	case ETHERTYPE_LAT:
318	case ETHERTYPE_SCA:
319	case ETHERTYPE_MOPRC:
320	case ETHERTYPE_MOPDL:
321		/* default_print for now */
322	default:
323		return (0);
324	}
325}
326
327
328/*
329 * Local Variables:
330 * c-style: whitesmith
331 * c-basic-offset: 8
332 * End:
333 */
334
335